Stop-motion device



June 27, 1933. 1 E. B. ALLEN ET AL STOP-MOTION DEVICE original FiledApril 24, 192el 5 'sheets-sheet 1 IN V EN TORy Edward wall/@Zier AllenView A TTORNEY June 27, 1933. V E. B. ALLEN ET AL 1,915,910

STOP-MOTION DEVICE Original Fi1ed`April 24, 1928 5 Sheets-Sheet 2 IN VEN TORS Edward /Zelz BY "af /lfaler @wir ATTORNEY June 27, 1933. E. B.ALLEN ET Al. 1,915,910

STOP-MOTION DEVICE original Filed April 24, 1928 5 Sheets-sheet 3 IN VEN TORS du/Wd bAZ/elz,

and

A TORNEY June 27, 1933,1 E, B. ALLEN ET AL 1,915,910

STOP-MOTION DEVICE Original Filed April 24, 1928 5 Sheets-Sheet 4 June27, 1933.

E. B. ALLEN ET AL v STOP-MOTION DEVICE Original'Filed April 24, 1928 5Sheets-Sheet 5 INVENTORS Edward Alle@ BY md l/ZzZ/ef' '/Yyefnr vATTORNEY y 3Q be operated to lprovide a stop-motion device,

Patented June 27, 1933 UNITED STATES AlAT`E`-`1fr orns EDWARD R. ALLEN,on NEw'rowN, AND wALrnRiyivnRs, on RRIDGRZPORT, coifmnorrour, AssreivoRs'ro THR SINGRRMANUFAOTURINGsolarium, or Rnrzannrmnnw JERSEY, AcoRroRATIoivon NRW'JRRSRY x l STOP-MOTION Dnvrcn' l J .Originalapplication'led April 24,1928,ISeria1 N0. 272,416,1an'd inVGrreat"Britain May 30,` 1928. Divided and this application led February23, 1929. Serial'No. 342,069; z a

y used is shown' in the patent to Allen,

This invention relates to devices for yS'topl ping machines, such assewing. machines, at

a predetermined time and with-the parts in a predetermined position.'

, 'One form of stop-motion device commonly No.

743,213, of Nov. 3, 1903. Ithcomprise's a` l stop-cam fiXedftotheldriven machineshafft and formed with, an4 yecfvxent-ric-portion ntollowed by aHstop-notch; such cambeing connected through buffer-springmeansto the plunger and nally required driven sha-ft. tiltingstop-motion lever carrying a spring-pressed plunger is arranged to movethe plunger sidewlseto a position within range of the eccentric-pon tionof the stop-cam which depresses the permits ,the plunger to rise intothe stopsnotch,l thereby abruptly stopping the shaft and locking it in apredetermined position. The` shock of stop-v ping the movingparts of themachine is borne by he 1cuiller-spring means between the stop-cam andthe machine shaft. This shock is in the nature of a sharp hammer blow/and is suchthat quite a strong buffer-spring is to absorb it. Knownstop-motions of this character are aispeed-limiting factor of machinesyto which they are-applied. In fact a machine with such a stop-'motionmust yat a moderate speed or-,consid erable difliculty is eXperiencedwith bufferspring breakage and distortion or undue wear on the parts. cv f The present invention has for an object which will machine speedswith increased production, and in which the shock of stopping themachine is materially reduced and buffer-spring breakageis overpermit ofhigher come. Another object of the invention'is to adapt the stop-motiondevice Jforuse more particularly with buttonhole sewing machines inwhich the power for operating the buttonhole cutter isy derived from themoe mentum of themachine acting preferably through the stop-motiondeviceafter the machine isdisconnected from its driving means; a furtherobject being to secure increased for operating the buttonhole cuttenpower y' CStill"hirther, the invention has for' an object to prot/'ideastop-motiondevice inzwhich the time-period in which the stop-motion le#ver may be tripped to secure proper cooperation of the parte 1sbroadened, thus render-v itvunnecessary to ladjustwthe tripping timewith as high a degree ofjaccuracy. as

To the attainment of the ends in view, the usual stop-camvof thestop-motion device, instead of being mounted upon the drivenfshaft ofthe machina-is associated preferably with an idly running gear meshingwith a' smaller pinion Xed to the driven shaft, whereby the stopfcamiscaused to run, say,-at onefhalf motion lever being moved laterally fromits oldposition below the mainfshatt, to its Since* the new positionbelow the gear. stopfcam runs y athalt its formerspeed, it follows thatthe machinehas twice the timeto run under its own momentum from the timethe power is thrown oli until the positivestop comes into play. 1 Thisincreased coasting time results in an: absorption of energy by frictionin the machine bearings and a lessen-` ingy ofthe energy tof-be absorbedby the stopmotion device. m Furthermore, the character of they blowimparted to thefYbuer-spring means is changed. lnsteadpf being in thenature of a sudden or shar'phammer blow, itis more like a push and canybe better absorbed by the buli'er-spring withy less strain upon thelatter. Still further, ywhen applied to a buttonhole sewingmachine ofthe type where lthe'buttonhole cutter is operated by the down-motionofthe stop-plunger under the influence ofthe*eccentric-portion ofthe usualstop-cam, the two-to-one reduction gearing gives increased power. forcutting the buttonhole, as may-'be desirablel with heavy materials or.,when cross-seams'are encountered. f- .M ;.4 .y In .the accompanyingdrawings, Fig. l

vis a. side =elevation of abuttonhole sewing mae l bottom plan View ofthe machine. Fig. 3 is a rear end elevation of the machine. Fig. 4 is adisassembled perspective view of the idly running gear and'associatedparts, including the stop-cam. Fig. 5 isa top plan'view of the upperparts of themachine carried "by the bracket-arm. Fig. 6 is a section, onan enlarged scale, on the line.6-6, Fig. 1.- Fig. 7 is asection on theline 7-7, Fig. 5. Fig1`8 is a section on the line 8-8, Fig. 5. Fig. 9 isa transverse vertical section through the machine bed and bracket-arm,showing the driving connections for the feed-wheel which latter carriesthe usual stop-motion trippingpoint, and Fig. is a transverse sectionthrough the stop-motion lever.

As described in our copending application, Serial No. 272,416, filedApril 24, 1928, of which this application is a division,'the inventionis illustrated in its preferred embodiment in a sewing machine having abed 1 from which rises the standard 2 of the bracket-arm 3 terminatingin the head 4 in which the usual needle-bar 5 andbuttonhole cutter-bar 6are mounted. The needle-bar 5 carries the usual eye-pointed needle 7which cooperates `with the usual shuttle mechanism 8 to form thebuttonhole stitches. The cutter-bar 6 has fixed to its lower end theusual buttonhole cutting knife 6 which, at the end of the sewingoperation, is projected downwardly to cut the buttonhole slit.

The needle and' shuttle mechanisms are driven in the usual manner fromthe mainshaft 9'which is j ournaled within and length- Wise of thebracket-arm 3 and carries at its rearward end the tight and loosebelt-pulleys 10 and 11. The pulley 10 has an elongated hub 12 in whichgear-teeth are cut forming a pinion 13; the hub 12 being fixed to themain-shaft 9 by means `of the taper-pins 14 disposed on opposite sidesof the pinion 13 and bearing a 90O angularrelation to one another, asshown in Fig.v 6. The loose pulley 11 is journaled on the bushing 15,Fig. 7, which is confined to rotate with the shaft 9 by means of theypin 16 which enters a notch 1.7 in the bushing.

The sewing machine frame is formed at the bend of the bracket-arm,adjacent the upper end of the standard 2, with a boss 18 which islaterally offset from the rear main-shaft bearing 19 and hasfixedthereto the stud-pin 2O on which is journaled the gear-wheel 21meshing with the pinion 13. As will be noted in Figs. 3 and 5, thestud-pin 20 is parallel to the main-shaft 9 and is disposedsubstantially at the level of such main-shaft 'being merely displacedtoone side of the latter. The gearwheel 21 has a forwardly extending hub22 on which is journaled the usual' stop-cam 23 having the eccentricstop-plunger-depressing portion 24 followed by the stop-notch 25. Thestop-cam 23 has fixed thereto a pin 26` which extends through a slot `27in the face of the gear 21 and has yfitted thereon a block 28. The block28 is disposed within the cavity 29, Fig. 4, of the gear 21 and thereisl also fixed within the cavity 29 a second block 30; a pair ofbuffer-springs "31 being disposed within the cavity 29 between the fixed.abutment-block 30 and the movable block 28. A cover-platel 32 closesthe cavity 29 and is held thereon by screws/33.; 'The screw 34 holds theentire gear-wheel assembly on `the stud-pin y20.

Mounted on the standard 2, at the base of the latter, isthe bracket35having .spaced arms 36 for the trun-nion-iscrews 37 which support thetilting stop-motion lever 38 formed at its upper end with alateral arm39 carrying the belt-shipper fork 40. Mounted to slide vertically in thestop-motion lever38 is the usual stop-plunger 41 which is pressedupwardly by the spring 42. When `the -stopmotion lever 38 is in'runningordotted line position, Fig. 1, the upper end of the plunger 41 isdisposedlforwa'rdly ofthe cam 23 and is out of range of the latter. Whenthe stopmotion lever 38 assumes its stopping or full line position, Fig. 1, the plunger 41 is moved to a position under or within range ofthe cam 23, whereupon the eccentric-portion 24 of such cam firstdepresses the stop-motion upon at the end of the -sewing cycle by theVtripping-point 49 carriedfby thefeed-wheel 50; the feed-wheel beingconnected in the usual manner to move the work-clamp 50 on the bed 1 tofeed the work.

Fixed to the stop-motion plunger 41 b means of the screw 51 is thehorizontal balr 52 carrying at its outer end the roller 53 entering theslot 54 in the rearward end of the lever 55 which is fulcrumedat 56onthe standard 2. The lever 55 is connected in the usual mannerv to thecutter-bar 6 by means of the link 57, lever 58 The link 57 has pivotedthereto at 60 the the stopl and link 59.

'loo

ilo

lower end of the latch 61 having at its upper end a shoulder 62 whichengages under the pin 63 carried by the lever 58 and passes through the:slotted upper end of the link 57. This is the usual manual release,disclosed'insaid Allen Patent No. 743,213, for preventing the operation`of the cutter-bar by the stop-motion device; the releasebeing eiected bymanually swinging the link? 6l main-shaft "Y frame. and extendingbracket-arm, of a pinion fixed to saidmain-j shaft, a. gear larger thanlsaid pinion and meshing 'with the latter, said gear being jour-3 whichis given a step-by-step motion by the pins 7l carried by'the beveljgear72 whichv meshes with the main-shaft 9.-y l.

llt-will be noted from the foregoing del scription that the ypowerfordriving the ma'- chine is ynot transmitted through the gearing i8, '21,but-is transmitted directly from they pulley 10 to the main-'shaftv 9,the gearl which carries the stop-cam 23 r running idly without noise orwear and tear while the machine is in operation. A The tripping'point 48should be adjusted to release the stop-motion lever 38 at a time whenthegconcentric or low portion of the stop-cam 23 is adjacent `the upperend of the plunger-bar 4l. On the cam'23 there is an angular space ofabout 90 where the tripand permit the plungerpinginay take place bar 41to pass under the cam for engagement by the eccentric cam-portion 24. Asthe cam 23 lis geared to run at-half the speed of the 9, it follows thatthe ymain-shaft may turn through a space of 180 or twice as far as wouldbepermissible were the'cam 23 mounted' on the main-shaft. Hence it isnot necessary toadjust the setting of the tripping' point 48 toY thedegree :of accuracy heretofore required. n

It is foundthat with the-*present stopmotion device lighterbuffer-springs may be used with increased machinespeed and, due to themore gradual character of the blow absorbedby such buffer-springs,breakage of the latter is eliminated.

Having thus set forth the nature ofthe invention, what we claim hereinis l. In a stop-motion device, theLcombination with a sewing machineframe having a bed, a standard and an overhanging bracketarm, and amain-shaft journaled in said lengthwise of `the naled alongsidethemain-shaft, a stop-cam,

the driving pinion 73 fixed vto abuifer spring connectingsaid stop-camto said gear, tight and loose belt-pulleys on said main-shaft, abelt-shipper lever fulcrumed onv said standard, and an vupwardlyspringpressed stop-plunger carried by said lever in a position displacedto one sideof a vertical atively .related to said stop-cam.

2.' A stop-motion device having, in combination, a-driven machine shaft,a pinion fixed on said shaft, tight and loose belt-pulleys on saidshaft, a gear-wheel larger than said pinion andmeshing with the latter,said gearwheel being journaled to run alongside the driven shaft whilethe machine is in operation l.and being formed in its rear face with abuffer-spring' cavity, buffer-spring means disposed in said cavity, astop-cam mounted adacent said gear-wheel and connected to rotate withthe`r latter through said buffer-springV means, stopping means movableinto and out offengag'ement with saidstop-cam, and a belt-shipperconnected to move with .said stopping means.

3.- Ina stop-motion device, the combination Awith ay driven shaft, ofa-tight belt-pulley fixed to said shaft and having an elongated y hubformedfintegrally with pinion-teeth, af l loose belt-pulley vjournaledon said shaft alongside the tight belt-pulley, a.k gear wheelplanethrough'` the main-shaft and cooperlarger than said pinion, saidgear-wheel being journaled at one side of the driven shaftand meshingWith-said pinion-teeth, a stop-cam, abuffer spring connecting saidstop-cam to said gear-Wheel, a stop-element cooperativelyk related tosaid stop-cam, and a belt-shipper connectedto said stop-element.v

4. In a stop-motion device, thecombination with a driven shaft and tightand loose..

pulleys on said shaft, ofa pinion fixed to said shaft, a gear largerthan said pinion, said gear ,meshing with said pinion kand being formedwith a buffer-spring cavity, buffersprlng means in said cavity, a.removable `cover-plate closing'said cavity, aistop-cam associatedWithsaid gear and connected to the latter through saidfbufer-springmeans,

a lstop-element cooperatively related to saidrv stop-cam, and abelt-shipper connected to move with said stop-element.` y i l Intestimony whereof, we

names to this specification.

, y vEDVVARD BALLEN.

. WALTER'MYERS.

l U5 have signed; our i

